sql查询数据过多内存溢出怎么办

String sql = " SELECT uid，uname  FROM t_user LIMIT ?,? " ;
        PreparedStatement  ps = con.prepareStatement(sql) ;
        int pageSize = 10000; 
        int pageId = 0; 
        do { 
            pst.setInt(1, pageId * pageSize); 
            pst.setInt(2, pageSize); 
            ResultSet rs = pst.executeQuery();

            boolean isEmpty = true; 
            while (rs.next()) { 
                 isEmpty = false; 
                 id = rs.getInt(1); 
                 name = rs.getString(2); 
            } 
            if (isEmpty) { 
                break; 
            } 
            pageId++; 
        } while (true); 
        con.close(); 
    } catch (SQLException e) { 
        e.printStackTrace(); 
    }

"jdbc:mysql://localhost:3306/db3?useCursorFetch=true&defaultFetchSize=100";